Access to MongoDB service from docker container

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I’m trying to setup mongo db service on Travis to be used for my integration tests running in the docker container. My travis configuration that initializes mongodb is:

env:
  global:
    - MONGODB_URI: mongodb://fillrx_test:test@127.0.0.1:27017/fillrx_test_db
services:
  - docker
  - mongodb

before_install:
  - sleep 15
  - mongo fillrx_test_db --eval 'db.createUser({user:"fillrx_test", pwd:"test",roles:["readWrite"]});'
  - docker build -t jeremycod/api-test -f ./server/Dockerfile.dev ./server

script:
  - docker run --env MONGODB_URI -e CI=true jeremycod/api-test npm test

after_success:
  - docker build -t jeremycod/fillrx-client ./client
  - docker build -t jeremycod/fillrx-nginx ./nginx
  - docker build -t jeremycod/fillrx-api ./server
  # Log in to the docker CLI
  - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_ID" --password-stdin

  # Take those images and push them to docker hub
  - docker push jeremycod/fillrx-client
  - docker push jeremycod/fillrx-nginx
  - docker push jeremycod/fillrx-api

deploy:
  provider: elasticbeanstalk
  region: 'ca-central-1'
  app: 'Fillrx'
  env: 'Fillrx-env'
  bucket_name: 'mys3bucketname'
  bucket_path: 'assets'
  on:
    branch: master
  access_key_id: $AWS_ACCESS_KEY
  secret_access_key: $AWS_SECRET_KEY

However, this fails on Travis with the connection refused error:

1) Create address endpoint /api/v1/address/user/userId

       "before all" hook: connectToTestDB for "Create address with correct input":

       MongoNetworkError: failed to connect to server [127.0.0.1:27017] on first connect [Error: connect ECONNREFUSED 127.0.0.1:27017

       at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1146:16)  {

            name: 'MongoNetworkError'

       }]

Obviously, MongoDB service is not available from the docker container on this address, but I can’t find anywhere in documentation how to correctly setup this.

Anyone can help with this?

Thanks